231504345 has 32 divisors (see below), whose sum is σ = 415584000. Its totient is φ = 122262912.

The previous prime is 231504331. The next prime is 231504349. The reversal of 231504345 is 543405132.

231504345 is a `hidden beast` number, since 2 + 315 + 0 + 4 + 345 = 666.

It is not a de Polignac number, because 231504345 - 2¹² = 231500249 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (231504349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5581 + ... + 22229.

It is an arithmetic number, because the mean of its divisors is an integer number (12987000).

Almost surely, 2^231504345 is an apocalyptic number.

It is an amenable number.

231504345 is a deficient number, since it is larger than the sum of its proper divisors (184079655).

231504345 is a wasteful number, since it uses less digits than its factorization.

231504345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16766 (or 16760 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 231504345 is about 15215.2668395924. The cubic root of 231504345 is about 614.0254642893.

Adding to 231504345 its reverse (543405132), we get a palindrome (774909477).

It can be divided in two parts, 23150 and 4345, that added together give a triangular number (27495 = T₂₃₄).

The spelling of 231504345 in words is "two hundred thirty-one million, five hundred four thousand, three hundred forty-five".